Sectional steam boiler



(No Model.) 2 Sheets-Sheet 1.

H. D. RICE.

SBGTIONAL STEAM BOILER.

No. 390,312. Patented Oct. 2, 1888.

'T Q R R u. l Z

(NoModel.) V 2 Sheets-Sheet 2. H. D. RICE.

SEGTIONAL STEAM BOILER.

No. 390,312. Patented Oct. 2, 1888.

UNITED STATES PATENT EEteE,

HARVEY D. RICE, OF BROOKLYN, ASSIGNOR TO THE ABENDROTI-I ROOTMANUFACTURING COMPANY, OF NEW YORK, N. Y.

SECTIONAL STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 390,312, dated October2, 1888.

Application filed .Tulyl l, 1858. Serial No. 279,958. (No model.)

To (LZZ whom it may concern:

Be it known that I, HARVEY D. RICE, a citizen of the United States, anda resident of the city of Brooklyn, in the county of Kings and State ofNew York, have invented certain new and useful Improvements in SectionalSteam- Boilers, of which the following is a complete description,reference being had to the accompanying drawings, forming part ofthisspeciro fication.

My invention relates to that class of boilers known as sectionalsafety-boilerst'. 6., which are composed of an aggregation ofsmallelements or sections, and more particularly to that variety of sectionalboilers known as water tube boilers, in which the elements or sectionsare in the shape or composed of tubes suitably connected to each other;and the object of my invention is to improve the distribution of thefeedwater to the several elements or sections of such boilers, and alsoto make improved provisions for the precipitation into the mud-drum ofthe impurities in the feed-water, thereby lessening the liability 2 ofinj nry to the heating-surfaces.

In the accompanying drawings, Figure 1 shows a side elevation of myimproved watertube sectional boiler with the side wall removed. Fig. 2shows a rear elevation of the 0 boiler with the rear wall removed, andFig. 3 is a horizontal sectional view on line X X ofa portion of therear end of the boiler.

Jorresponding letters of reference designate corresponding parts in theseveral views.

5 A are the water-tubes, which are set at an angle, the pitch beingdownward toward the rear end of the boiler. The 'front ends of the tubesA are connected either in sets or all together, and so are the backends. In the boiler 0 shown in the drawings the tubes are expanded inpairs into hollow fittings or headers H at the rear and H at the front.These headers are set in horizontal rows, there being seven headers (orfourteen tubes) in each horizon- 5 tal row. Vertically the headers areslightly staggered, so as to cause the tubes to be evenly staggered andthereby present the greatest possible surface to the flame. The headersare connected at front and back by means of bends B, so arranged thatthey connect each header with the one just above it, and thereby sevensections are formed in the size of boiler I have shown, each sectiontaking in one header on each horizontal row.

The dotted zigzag line in Fig. 2 indicates the direction of the waterwaythrough the headers and bends of one section, the connections beingidentical at the front end of the tubes.

\Vhile I have shown and described here a peculiar arrangement of tubes,headers, and 63 connecting-bends, and a given number of sections--viz.,seven-I wish to state that myin vention is not limited in itsapplication either to this form or number of sections or headers, butthat I contemplate to apply it in the same mau- (:5 ner and for the samepurposes and with the same results to boilers with a different form ofheader, or with a header common to a greater number of tubes, or to allthe tubes in a section, or even to all the tubes in the boiler.

The upper front header of each section in my boiler is connected withthe front end of ahorizontal drum, D, the rear end of which'is connectedby means of a vertical pipe, 0, which I term the downtake, with ahorizontal feeddrum, F. Below this drum F and below as well as in therear of the lower tubes A is a mud drum, M, also horizontal, connectedwith the feed-drum F by means of two vertical pipes, E, thecross-sections of which should So much more than aggregate the aggregatecross section of the downtakcs C. The mud-drum M is also connected withthe lower rear header of each section by means of the pipes in, one ofwhich is provided to each section.

20 to indicate the water line.

S is a horizontal pipe or drum connected to the drums I) and carryingoff the steam there from.

Thegrateis shown at G,andsuitable septum- 9o walls are provided, (intheshape ofa brick partition at I and partitions formed of contiguouscollars on the tubes at L L,) to guide the gases from the grate G to theuptake U. The side walls ofthe fire-chamber are formed of brick 5 work,while the end walls are formed by the headers all fitted against eachother.

K are cleaning-doors in the side walls. 0 is the feedpipe, and P is theblow-off pipe, the former being attached to the middle of the FeeddrumF, while thelatter is attached to the middle and near the bottom of themuddrum M.

The circulation in my boiler takes place toward the front in the tubesA, toward the rear in the drums D, and downward from the rear of thedrums D to the back ends of the tubes A.

It will be noted in the drawings that the downward connection from therear ends ofthe drums D to the rear ends of the tubes A is made at therear ends of the lower tubes, the object of this being to bring thesupply of water directly to such lower tubes, wherein, from their closeproximity to the fire, the circulation is most active. The course of thewater to the upper rows of tubes is therefore upward through the rearheaders. The muddrum M is so connected that all water descending fromthe drums D must pass through it beforeit can enter the tubes A. I makethe muddrum M and the pipes E as large as practicable so as to retainthe tlow therein, and I connect the pipes at (whichlead to the tubes A)at the top of the mud-drum M, all of which features of my design tend toinsure easier precipitation of the impurities into the muddrum M.

My invention consists in the use of a separate feed-drum, F, formingpart of the downward-eonnecting system through which the water travelsfrom the rear ends of the drums D to the rear ends of the tubes A,passing as it does so through the drum M. The function of the drum F isto avoid chilling the muddrum M and stirring up the matter settledtherein which is caused by attaching the feed to said drum.

Another advantage is gained from the fact that the water fed into thedrum F becomes heated by mingling therein with the water de- Scendingthrough the downtakes C, and is therefore under more favorableconditions for parting with itsimpurities in the mud-drum M.

I could use instead of the two pipes E as many corresponding pipes asthere are sec tions in the boiler. The use of two, however, gives freeraccess to the rear headers for purposes of erection or repair.

I wish to state, also, that my invention does not contemplate the use ofone separate drum D to each section as a necessary feature. A commondrum might be provided to connect all the sections.

IVhile therefore I do not wish to be constrned as limiting the scope ofmy invention to the specific form and arrangement of boiler shown, whatI do claim as my invention, and desire to secure by Letters Patent, is

1. In a sectional steanrboiler of the type above described, the downwardconnection from the rear of the drums D to the rear ends of the tubes Aby means of and through the downtakes 0, horizontal feed druni F, pipesE, horizontal mud-drum M, and pipes m, as and for the purposesspecified.

2. In a sectional steambeiler of the type above described. thecombination, with the water-tubes A, having suitable headers andconnections to eachother, and to the drums D of the latter, thedowntakes G, the feeddrum F, the stand-pipes E, the muddrum M,

and the pipesm, leading to the lower rear end of each section of tubes,all as and for the ob jects set forth.

In witness whereof I have hereunto set my hand this 13th day of July,1888.

HARVEY D. RICE. In presence of W. H. LERCH, A. HOWARD ABENDROTH.

